Why is there no power at the fuel pump on my 1986 ford e350 jamboree?

i have a 1986 ford econoline 350 jamboree motorhome. It has a 460 v8 gas motor. The fuel pump isn't working. I checked with a test light and there is no power going to the pump. I checked the inertia switch under the dash and hit the reset button and used my test light on that and there is power going in and out of it, i used to my test light on the oil pressure switch and there is power going to that. The camper won't start and was having problems with vapor lock. I checked all the fuses and tried tracing the wire from the fuel pump but i'm not sure where it goes. I did have mice in the camper that could have chewed the wire but i would need a wiring diagram for my camper. If anyone has a wiring diagram of the fuel pump on my camper i would appreciate it. Would replacing the fuel pump fix the problem? I had the switch on when i checked all the wires with my test light.
Added (1). it has a carburetor, no fuel injection

Read more: Why is there no power at the fuel pump on my 1986 ford e350 jamboree?